Safety device for gas ranges, gas boilers, etc.



.Feb. 18,1936. w KATZ 7. 2,031,415

SAFETY DEVICE FOR GAS RANGES; GAS BOILERS, ETC

Original Filed April 15', 1931 INVENTOR Willy ifaiz ATTORNEY vll Anotherobject of my invention is the provision Patented Feb. 1a, 1936 UNITEDSTATES SAFETY DEVICE FOR GAS RANGES, GAS

' BOILERS, ETC.

Willy Kata, New York, N. Y.

Continuation 01' application Serial No. 530,263. April 15, 1931. Thisapplication August 12,

1933, Serial No. 684,908

1 Claim.

This invention relates to improvements in safety devices. particularlyto an electrically controlled valve for gas stoves or the like gasconsuming apparatus, as for instance disclosed in 6 my pendingapplication, Serial Number 530,263, filed April 15,1931, of which thisapplication is a continuation and for which it is to be substituted.

It is the principal object of my invention to 10 provide a safety devicein which the gas is ignited by means of a resistance and its supply iscontrolled by an electromagnetically operated valve ensuring thelighting of the gas and preventing any escape of gas when not ignited.

of a safety device for gas stoves equipped with a thermostat of thebi-metallic type to keep the electromagnetic-ally controlled valve openwhile the gas is ignited and to close the valve as soon" as the gasflame is extinguished.

Still another object of my invention is the provision of a safety devicefor gas stoves equipped with means to allow a mechanical operation ofthe opening and closing means for the electric circuits, yet preventingaccidental operation thereof.

A further object of my invention is the provi-' son of mechanicallyoperated contact means to close the ignitercireuit and open the gassupply valveto the burner and to open said circuit as soon as the gashas beenignited.

A still further object of my invention is th provision of a controlsystem for the burners of gas ranges or the like avoiding the use ofpilot lights and positively preventing accidents by the escape of gasfrom an unlit stove permitting a manual operation of the circuit closersas well as their automatic closing and opening during the operation ofthe stove.

40 These and other objects and advantages of my invention will becomemore fully known as the description thereof proceeds and will then bemore specifically defined in the appended claim.

In the accompanying drawing forming a material part of this disclosure:

Fig. 1 is a sectional side elevation of a safety device for gas rangesconstructed according to my invention.

Fig. 2 is an end view thereof.

.30 Fig. 3 is a section on line III-III of Figure 2.

Fig. 4 is a detail view of a gas burner with a thermostat circuitcloser.

As illustrated. a gas supply pipe 42 connected at its lower end with anygas supply pipe in the 55 usual manner is connected with a valve casinglever 4 into 48 at its upper end and the flow of the gas is controlledby the usual manually operated regulating valve l8.

The valve casing 48 is connected by a pipe stem 49 having an air ventwith the gas burner 4|. while a nozzle 44 is screwed into valve casingand pipe stem.

. an accidental operation of the same. is

The rear end of push button i is equipped with a flange 53 adaptedtoengage a nose formed on a lever 4 intermediate its'ends.

Lever 4 of insulating material is attached at its lower end to a shaft56, and at its upper end has connected thereto one end of a spring 24,the other end of which is connected to a peg on the inner wall of casing50.

The lever 4 is also connected at its upper end by means of a linkconnection 54 with a piston 55 working in the dash pct ii.

The lower end of lever 4 is curved and carries a pawl 25 pressed bymeans of a spring 48 into engagement with the teeth of, a comparativelylarge ratchet wheel 5 of non-conducting material rotatably arranged onthe insulated shaft 56 and provided at its front face with the pairwisearranged contaet. pieces 23 and 3| and 23'-3l' respectively. p

In front of wheel 5 shaft 56 carries a wheel I also of non-conductingmaterial secured thereto and equipped with contact pieces 36, 31 on itsfront face.

Upon the rotation of wheel 5 by means of lever 4 its contact pieces 23and Si come into contact with spring contacts 30 and 2| while contactpieces 36, 31 of wheel 3 must be of a size suiilcient to bring them uponthe rotation of wheel 3 by engagement with contact springs 22 and 2. 45

Contact 30 is connected by a conductor wire 28 to one pole 32 of abattery or plug socket of a source of electricity, while contact 2| isconnected by a wire 38 to one end of a resistance coil l2. the other endof which is connected by means of wire 40 to the other pole 33 of thebattery or plug socket.

Contact 2 is connected by means of wire 28 to thebinding post 28 of anelectromagnet 8. the other binding post 29 of which is connected byaoanus wires 21 and to one pole SI of a biemetallic thermostat II, theother pole 28 of which is connected by wires 24 and 21 to pole 23 of thebattery or plug socket. A spring contact I! on the thermostat It isnormally held spaced from a contact piece ll of the same near'the poleII thereof.

' The electromagnet 6 is arranged partly in valve casing 48 and partlyin the movable metallic body 10 of valve 8, and a spring in rests at oneend against Y the end of body 8 and at its other end against a lock nutIi in casing 48 and is wound about electromagnet 8 although spacedtherefrom.

A look nut I on the screw 8 holds the electro- 5 magnet I in place whilethe movement of body it is cushioned by means of a spring 2| in body II,between the core end is of the electromagnet and the end wall of thebody 8. I

It is the purpose of non-metallic wheel I to avoid permanent closure ofthe circuit through wires 28, 26' as in such case the circuit|would beinterrupted only through an'accidental ex tinction of the flame whichwould set the thermostat out of commission, while wheel 5 enables anarbitrary shutting oil! of' the gas by interrupting the circuit at willby means of wheel 5.

The device operates as follows: When it is desired to start the stove'orto lgnite any burner thereof, the push button I is 30 pushed inwardly tomove lever I against the action of its spring 24, pawl 25 will turnwheel 5 to bring its contact pieces 23, 3| into engagement with springcontacts 3|! and 2| respectively.

. Slmultaneously'shaft lit and wheel 3 thereon 3 will turn to bring itscontacts 38, 31 into engagement with spring contacts 22 and 2, and thefollowing circuits will be closed:

The circuit in which the igniter i2 is located,

cross wire 38, contact 2, contact 81, wheel 3, con- 40 tact 3B, springcontact 22, wire 26 to pole 32, battery, pole 22, wire 40 to igniter l2.The igniter is then made to glow to ignite the gas, and the gas flamewill cause the operation of the thermostat for closing the thermostatswitch. By the closing of the thermostat switch a circuit is closed frompole 35; across wire 43 and wire 21 to pole 29 of the electromagnet,pole 28 of same, wire 26, contact spring 2|, contact 3|, wheel 5,contact 22, contact spring 30, wire 26 to the pole", po

" 22, wire 24 to pole 39 of thermostat.

r The energization of the electromagnet will attract, body 8 to open thegas valve and if now the gas supply is turned on by means of valve I!the igniter will ignite'the same.

If now spring 24 which through the rearward motionof lever I has beentensioned, expands again, lover I will slowly return into its originalposition on account-of the dash pot arrangement and turn wheel I tobring its contact pieces I8. 31 out of engagement with spring contacts22 and 2 and open the igniter circuit.

If the gas supply is out of! or the flame of the burner for any reasonis extinguished, the thermostat will cool oi! and open the, circuitacross the electromagnet and deenergize the same, so that springs Illand 2| will return valve body 9 into its valve closing position byengagement with nozzle It to prevent the escape of gas.

The cyclus of operations is then repeated by pushing button I inwardlyin order to bring contacts 22' and 3|, of wheel 5 and the contacts ofwheel 3 again into circuit closing position as aforedescribed.

It will be understood that I have described and shown thepreferred formof my device only as one example of the manypossible ways to practicallyconstruct my invention and that I may make such changes in its generalarrangement, and in the construction of the, minor details thereof ascome within the scope of the appended claims without departure from thespirit of my invention and the principles involved. v Having thusdescribed my invention what I claim as new and desire to secure byLetters Patent is: l

A safety device for gas stoves comprising a gas burner, anelectromagnetically controlled cut-oi! valve controlling the supply ofgas to said burner, an igniter, a circuit in which said igniter islocated, a push button operating a spring controlled lever, contactwheels operated by said lever to close said igniter circuit to glow saidigniter. the spring of said lever returning the same into its originalposition after each operation by said button, for opening the ignitercircuit, a thermostat and' a circuit in which said thermostat is locatedto be closed upon the closure of said igniter circuit to heat thethermostat by the heat developed by the glowing igniter upon the closureof its circuit by said lever'operated contact wheels, an electromagnetin said thermostat circuit to be energized upon the closure of thiscircuit to open the valve for supplying gas to said burner, and to bede-energized upon the extinguishing of the burner flame and consequentcooling oil of the thermostat, and springs formoving the valvemechanically into its gas supply cutting off posi-' tion.-

WILLY KATZ.

